Christmas Island red crab migration. Each year they travel from the forest to the seashore to breed.

Christmas Island: Christmas Island may look like a tiny rock in the Indian Ocean, but it is home to more than 50 million red crabs that complete one of the most harrowing and visually stunning annual migrations. Traveling from deep within the islandâs forest to the seashore, these fire engine-red, dinner plate-sized crabs battle against fierce acid-spitting yellow ants as they scuttle to the water and back only once a year to breed.